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<blockquote data-quote="regolith" data-source="post: 727449" data-attributes="member: 9267"><p>5:1 is a generally quoted figure - I'm not sure how it originated, but it takes into account reproductive failure, pregnant cows that get shipped, stillbirths.</p><p></p><p>Just for example - little over 2 years ago I was running 155 cows and did about 180 dairy insems in 6 weeks (standard frozen semen from LIC, tho that's not normal practice in this country as most use the fresh liquid straws). All other matings were beef semen or by the herd bull.</p><p>I got a fairly exact 50/50 ratio of heifers and bulls. 47 dairy heifers born, two of them were twinned to bulls. Today I have 45 yearling heifers running with a bull 180:45 is exactly 4:1</p><p>So that's the number I work on when deciding how many cows to mate to dairy/how many inseminations total I need to do to get the number of heifers I'll need. Initial conception rate is 65 - 70% (the ones that don't return to heat within 24 days).</p><p>This is higher conception rate than any of the experienced technicians who've inseminated cows in my own herd or herds I've managed... I just accept it with gratitude and don't ask why. I suspect that's why 5:1 is a more common ratio.</p></blockquote><p></p>
[QUOTE="regolith, post: 727449, member: 9267"] 5:1 is a generally quoted figure - I'm not sure how it originated, but it takes into account reproductive failure, pregnant cows that get shipped, stillbirths. Just for example - little over 2 years ago I was running 155 cows and did about 180 dairy insems in 6 weeks (standard frozen semen from LIC, tho that's not normal practice in this country as most use the fresh liquid straws). All other matings were beef semen or by the herd bull. I got a fairly exact 50/50 ratio of heifers and bulls. 47 dairy heifers born, two of them were twinned to bulls. Today I have 45 yearling heifers running with a bull 180:45 is exactly 4:1 So that's the number I work on when deciding how many cows to mate to dairy/how many inseminations total I need to do to get the number of heifers I'll need. Initial conception rate is 65 - 70% (the ones that don't return to heat within 24 days). This is higher conception rate than any of the experienced technicians who've inseminated cows in my own herd or herds I've managed... I just accept it with gratitude and don't ask why. I suspect that's why 5:1 is a more common ratio. [/QUOTE]
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